I never said that KC85/3 Digger was an original game (but I would assume it's more inspired by Boulderdash than the Atari Digger version, but I guess only the a

I never said that KC85/3 Digger was an original game (but I would assume it's more inspired by Boulderdash than the Atari Digger version, but I guess only the author knows that). I only said that the original of the OP's Javascript "re-implementation" was the KC85/3 game Digger (e.g. the gameplay, graphics and audio is exactly the same).